ls9pudong - Ingmar Chen

Concentration of salt
Ingmar Chen

Hypothesis
we want to know if the change of concentration of salt effect the
flow of electricity. we think it does because electricity need salt

Variables
Independent variables:concentration of salt
Dependent variables: tempreture ; distance between two metal ; amount of water ; size of metals. time

Procedure
1.Take one cup
2.take two of the same size metals. (aluminum, copper)
3. Record the amount of water we pour in.
4.different amount of salt will put in each times . (10g, 15g, 20g,25g, 40g)
5. Test the voltage by using the multimeter.

we will use wood to make the distance between two metals the same.

	Voltage	curency
cupA(10g)salt	0.55	0.78 0.76after10sec.
cupB(15g)salt	0.55	1.50 1.29after10sec.
cupC(20g)salt	0.56	1.93 1.82after10sec.
cupD(25g)salt	0.56	1.8 1.7after10sec.
cupE(40g)salt	0.57	2.54 2.41after10sec.